Master Lock Magnum 1-3/4 In. Laminated Steel Padlock Master Lock Magnum laminated padlocks feature a 1-3/4 In. 44Mm. wide laminated steel body for maximum strength and reliability and is surrounded by stainless steel and zinc outer components for weather resistance. The 5/16 In. 8Mm. diameter octagonal shackle is 2-1/2 In. 64Mm. long and made of Tough-Cut boron-carbide, 50% harder than hardened steel, offering maximum resistance to cutting and sawing. the 4-pin cylinder prevents picking and the dual locking ball bearings provide maximum resistance against prying and hammering. The lifetime guarantee provides peace of mind from a brand you can trust. Type 2Pk, Keyed alike, Body Width 1-3/4 In. 44Mm. , Body Material Magnum, Shackle Dimensions 2-1/2 In., Shackle Diameter 5/16 In., Shackle Horizontal Clearance 13-16 In. 21Mm. , Shackle Vertical Clearance 2-1/2In. 64Mm. , Locking Mechanism 4-pin cylinder, Finish Stainless Steel Zinc, Pkg Qty 2, Package Type Card